Yesterday, the police arrested Rodlyn Petitbois (pictured), who they believe killed a Massachusetts woman who sheltered Petitbois's girlfriend and their four children. Petitbois was found walking down a street while the children and mother were found in Prospect Park. Petitbois allegedly stabbed Greenland Etienne, who had been trying to stop him from attacking girlfriend Louna Eveillard, early Wednesday in Lynn, MA. Petitbois had stabbed his girlfriend in the hand, and when Etienne tried to call......